This was a cause Sylvia was to devote herself to for more than a decade.

But the course of her political development was very different from the two more famous Pankhursts – her mother Emmeline and her older sister Christabel – and the political conclusions she drew led her towards socialist organisation.

Local campaigners have won recognition for anti-war activist, suffragist and revolutionary socialist Alice Wheeldon who died in 1919 after a state-run conspiracy to destroy her.

Over 100 people including Ms Wheeldon’s great grand-daughters Chloe and Deirdre Mason, from Sydney, Australia, attended the installation of a blue plaque commemorating a woman whom the city’s Mayor Lisa Higginbottom called a “great citizen of Derby.”

Ms Wheeldon, a Socialist Labour Party activist and close comrade of Communist Party founders Willy Paul and Arthur McManus, died of flu during the global epidemic.

She had been weakened by a hunger strike in prison after being convicted on a fabricated charge of conspiring to murder PM David Lloyd George and Labour leader Arthur Henderson.